The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Anolyte (0 members)
- DefinedEdgeCutting (1 member)
- Software (4 members)
- NonPrefixedUnit (36 members)
- PerThermalTransmittanceUnit (1 member)
- ManufacturingDevice (0 members)
- ActivationEnergyOfGuestDiffusivityInNegativeElectrodeActiveMaterial (0 members)
- BimetallicElectrode (0 members)
- PrismaticBattery (0 members)
- ManufacturedProduct (2 members)
- ElectricConductivityUnit (12 members)
- CounterElectrode (0 members)
- Spring (2 members)
- LengthA4 (0 members)
- PowerHold (2 members)
- MeasuredProperty (1 member)
- GasChromatograph (0 members)
- D60ParticleSize (0 members)
- Mixing intensity (0 members)
- WorkpieceManufacturing (4 members)
- ProticSolventCompound (6 members)
- PascalMetre (0 members)
- Fluid (3 members)
- ReciprocalSquareEnergyUnit (1 member)
- BatteryEnergy (0 members)
- SulfurAtom (0 members)
- VolumePerSquareTimeUnit (2 members)
- MilliFarad (0 members)
- SurfaceBC4 (0 members)
- R731 (0 members)
- SodiumSulfide (0 members)
- FunctionallyDefinedMaterial (0 members)
- MassPerTimeUnit (4 members)
- DischargingSpecificCapacity (0 members)
- MathematicalFormula (2 members)
- DirectCurrent (0 members)
- KilogramPerSquareMetrePerSecond (0 members)
- R2335 (0 members)
- SurfaceTension (0 members)
- SquarePressureTimeUnit (1 member)
- Resistance Temperature Detectors (RTDs) (0 members)
- ChromiumOxideCompound (2 members)
- Hydraulic Pressure Gauges (0 members)
- Sample (1 member)
- NumericalData (0 members)
- TimeConstant (2 members)
- FloatingPointData (2 members)
- Potassium (0 members)
- DensityOfVibrationalStates (0 members)
- Photoionization Detection (PID) (0 members)